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Unofficial firmware is third-party software that isn't supported by the manufacturer. It may have lower security standards, cause compatibility issues with hardware or apps, and be less reliable than official firmware.

Official firmware is provided by manufacturers who are certified partners of the platform, such as Google for Android devices and Apple for iOS devices.

Certification ensures that devices meet strict requirements for security, performance, and compatibility.

For further information, see the Google Play Protect certified devices and Apple Platform Security certifications.

Replacing custom firmware with original firmware is a technical task, that can damage your device if done incorrectly.

If you're not sure how to safely restore the official firmware, contact your device manufacturer’s help centre for professional support.